How to pass data from an Activity to an Adapter?

Hello my problem is the following one I am developing an app in android where I have an Activity and a RecyclerView.Adapter, where what I want is to pass some parameters from the activity to the adapter by means of in intent. The problem is that I can not send the data that is inside the method to send data to the adapter.

AssignTurning.java

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CalendarView;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Spinner;

import com.example.clinica.clinica.DTO.Atencion;
import com.example.clinica.clinica.DTO.Especialidad;
import com.example.clinica.clinica.DTO.Medico;
import com.example.clinica.clinica.sqlite.BaseDeDatos;
import com.example.clinica.clinica.sqlite.Tablas;

import java.util.ArrayList;
import java.util.Calendar;

public class AsignarTurno extends AppCompatActivity{

CalendarView calendarView;
RecyclerView turnoView;
public String fecha;
String hora, dia, medicos;
EditText edtPaciente, edtEspecialista;
ImageButton addPaciente, addEspecialista;
BaseDeDatos db;
Spinner spEspecialidades, spEspecialistas;
String nombre, apellido;
private Dialog dialog;
ArrayList<String> listaMedicos, listaEspecialidades;
ArrayList<Medico> MedicosList;
ArrayList<Especialidad> EspecialidadesList;
AtencionAdapter adp;
AtencionHolder holder;


String item;



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_asignar_turno);
    db = new BaseDeDatos(this, null, null, 1);
    turnoView = (RecyclerView) findViewById(R.id.listaTurnosDisponibles);
    turnoView.setLayoutManager(new LinearLayoutManager(this));
    turnoView.setItemAnimator(new DefaultItemAnimator());
    calendarView = (CalendarView) findViewById(R.id.calendario);
    addPaciente = (ImageButton) findViewById(R.id.addPaciente);
    addEspecialista = (ImageButton) findViewById(R.id.addEspecialista);
    edtPaciente = (EditText) findViewById(R.id.turnoPaciente);
    edtEspecialista = (EditText) findViewById(R.id.turnoEspecialista);



    addEspecialista.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            LayoutInflater inflater = getLayoutInflater();
            final View dialogLayout = inflater.inflate(R.layout.dialog_especialista, null);

            spEspecialidades = (Spinner) dialogLayout.findViewById(R.id.spEspecialidades);
            spEspecialistas = (Spinner) dialogLayout.findViewById(R.id.spEspecialista);
            Button aceptar = (Button) dialogLayout.findViewById(R.id.btnAceptarEspecialista);
            Button cancelar = (Button) dialogLayout.findViewById(R.id.btnCancelarEspecialista);
            cargarSpinnerEspecialidades();


            final ArrayAdapter<String> adaptador = new ArrayAdapter(AsignarTurno.this, android.R.layout.simple_spinner_item, listaEspecialidades);
            spEspecialidades.setAdapter(adaptador);
            spEspecialidades.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                    item = spEspecialidades.getSelectedItem().toString();
                    if (item == "Seleccione") {
                        spEspecialistas.setEnabled(false);
                    } else {
                        spEspecialistas.setEnabled(true);

                        cargarSpinnerMedicos(item);

                        final ArrayAdapter<String> adapter = new ArrayAdapter(AsignarTurno.this, android.R.layout.simple_spinner_item, listaMedicos);
                        spEspecialistas.setAdapter(adapter);
                        spEspecialistas.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                            @Override
                            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                            }

                            @Override
                            public void onNothingSelected(AdapterView<?> parent) {
                            }
                        });
                    }
                }

                @Override
                public void onNothingSelected(AdapterView<?> parent) {
                }
            });

            AlertDialog.Builder builder = new AlertDialog.Builder(AsignarTurno.this);
            builder.setView(dialogLayout);
            dialog = builder.show();

            cancelar.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });

            aceptar.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    edtEspecialista.setText(spEspecialistas.getSelectedItem().toString());

                    dialog.dismiss();


                }
            });


        }
    });


    addPaciente.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            LayoutInflater inflater = getLayoutInflater();
            final View dialogLayout = inflater.inflate(R.layout.dialog_buscar_paciente, null);

            Button buscar = (Button) dialogLayout.findViewById(R.id.btnBuscarPacienteDialog);
            Button volver = (Button) dialogLayout.findViewById(R.id.btnCancelarPacienteDialog);
            final EditText edtDni = (EditText) dialogLayout.findViewById(R.id.edtDialogDni);


            buscar.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    if (edtDni.getText().toString().length() > 0) {

                        Cursor c = pacientePorDni(Integer.parseInt(edtDni.getText().toString()));

                        edtPaciente.setText((c.getString(c.getColumnIndexOrThrow("apellido")) + " " + (c.getString(c.getColumnIndexOrThrow("nombre")))));
                        dialog.dismiss();
                    }
                }
            });
            AlertDialog.Builder builder = new AlertDialog.Builder(AsignarTurno.this);
            builder.setView(dialogLayout);
            dialog = builder.show();


            volver.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    dialog.dismiss();
                }
            });
        }
    });
    calendarView.setOnDateChangeListener(new CalendarView.OnDateChangeListener() {
                                             @Override
                                             public void onSelectedDayChange(CalendarView calendarView, int i, int i1, int i2) {

                                                 fecha = i2 + "-" + (i1 + 1) + "-" + i;
                                                 medicos = spEspecialistas.getSelectedItem().toString();
                                                 final AtencionAdapter adapter = new AtencionAdapter(AsignarTurno.this, listaAtencion(medicos));
                                                 turnoView.setAdapter(adapter);
                                                 Calendar c = Calendar.getInstance();
                                                 c.set(i, (i1+1) , (i2-3));
                                                 int diaSemana = c.get(Calendar.DAY_OF_WEEK);
                                                 dia = filtrarDia(diaSemana);
                                                 adapter.getFilter().filter(dia);
                                                 enviarDatos();

                                           }


                                         }

    );



}


public void cargarSpinnerMedicos(String item) {
    Medico m=null;
    SQLiteDatabase data=db.getWritableDatabase();
    String query = "SELECT * FROM " + Tablas.TABLA_MEDICO + " WHERE " + Tablas.COLUMNA_ESPECIALIDAD + " = '" + item + "';";
    Cursor cursor = data.rawQuery(query, null);
    MedicosList = new ArrayList<>();

    while (cursor.moveToNext()){
        m=new Medico();
        m.setNombre(cursor.getString(1));
        m.setApellido(cursor.getString(2));
        m.setEspecialidad(cursor.getString(10));
        Log.i("Nombre",m.getNombre());
        MedicosList.add(m);
    }
    obtenerListaMedicos();
}

public void obtenerListaMedicos() {
    listaMedicos=new ArrayList<String>();
    listaMedicos.add("Seleccione");
    for(int i=0;i<MedicosList.size();i++){
        listaMedicos.add(MedicosList.get(i).getNombre() + " " + MedicosList.get(i).getApellido());
    }
}

public Cursor pacientePorDni(int dni) {
    SQLiteDatabase bd = db.getWritableDatabase();
    String query = "SELECT * FROM " + Tablas.TABLA_PACIENTE + " WHERE " + Tablas.COLUMNA_DNI_PACIENTE + " = " + dni + ";";
    Cursor c = bd.rawQuery(query, null);
    if (c != null) {
        c.moveToFirst();
    }
    return c;
}


public void cargarSpinnerEspecialidades() {
    SQLiteDatabase data = db.getReadableDatabase();
    Especialidad e = null;
    EspecialidadesList = new ArrayList<Especialidad>();
    //select * from usuarios
    Cursor cursor = data.rawQuery("SELECT * FROM " + Tablas.TABLA_ESPECIALIDAD, null);

    while (cursor.moveToNext()) {
        e = new Especialidad();
        e.setNombre(cursor.getString(1));
        Log.i("Nombre", e.getNombre());
        EspecialidadesList.add(e);
    }
    obtenerListaEspecialidades();
}


public void obtenerListaEspecialidades() {
    listaEspecialidades = new ArrayList<String>();
    listaEspecialidades.add("Seleccione");
    for (int i = 0; i < EspecialidadesList.size(); i++) {
        listaEspecialidades.add(EspecialidadesList.get(i).getNombre());
    }
}



public ArrayList<Atencion> listaAtencion(String medico) {
    String sql = "SELECT * FROM " + Tablas.TABLA_ATENCION + " WHERE " + Tablas.COLUMN_ESPECIALISTA + " = '" + medico + "';";
    SQLiteDatabase bd = db.getReadableDatabase();
    ArrayList<Atencion> listaAtencion = new ArrayList<>();
    Cursor cursor = bd.rawQuery(sql, null);
    if (cursor.moveToFirst()) {
        do {

            String especialista = cursor.getString(1);
            String dia = cursor.getString(2);
            String hora = cursor.getString(4);


            listaAtencion.add(new Atencion(especialista, dia, hora));
        } while (cursor.moveToNext());
    }
    cursor.close();
    return listaAtencion;
}

public String filtrarDia(int diaSemana){
    if (diaSemana == 1) {
        dia = "Domingo";
    } else if (diaSemana == 2) {
        dia = "Lunes";
    } else if (diaSemana == 3) {
        dia = "Martes";
    } else if (diaSemana == 4) {
        dia = "Miércoles";
    } else if (diaSemana == 5) {
        dia = "Jueves";
    } else if (diaSemana == 6) {
        dia = "Viernes";
    } else if (diaSemana == 7) {
        dia = "Sábado";
    }
    return dia;
}


public void enviarDatos(){
    String pacienteTurno, fechaTurno, especialistaTurno;

    pacienteTurno = edtPaciente.getText().toString();
    especialistaTurno = edtEspecialista.getText().toString();
    fechaTurno = fecha;

    Intent intent = new Intent(this, AtencionAdapter.class);
    intent.putExtra("paciente", pacienteTurno);
    intent.putExtra("especialista", especialistaTurno);
    intent.putExtra("fecha", fechaTurno);
    startActivity(intent);

}

AtencionAdapter.java

import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;

import com.example.clinica.clinica.DTO.Atencion;
import com.example.clinica.clinica.sqlite.BaseDeDatos;
import com.example.clinica.clinica.sqlite.Tablas;

import java.util.ArrayList;
public class AtencionAdapter extends RecyclerView.Adapter<AtencionHolder> 
implements Filterable {

Context c;
ArrayList<Atencion> atencion, listaFiltrada;
FiltroAtenciones filtro;
BaseDeDatos db;
AsignarTurno turno;
String paciente,fecha, horas, especialista;





public AtencionAdapter( Context ctx, ArrayList<Atencion> atencion){

    this.c=ctx;
    this.atencion=atencion;
    this.listaFiltrada=atencion;
    db = new BaseDeDatos(ctx, null, null, 1);

}


@Override
public AtencionHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v= LayoutInflater.from(parent.getContext()).inflate(R.layout.item_turno_disponible,null);

    //HOLDER
    AtencionHolder holder=new AtencionHolder(v);

    return holder;
}

@Override
public void onBindViewHolder(AtencionHolder holder, int position) {
    final Atencion at = atencion.get(position);

    holder.hora.setText(atencion.get(position).getHoraInicio());
    holder.dia.setText(atencion.get(position).getDia());

    horas = atencion.get(position).getHoraInicio();


    holder.agregar.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Bundle bundle = turno.getIntent().getExtras();
            paciente = bundle.getString("paciente");
            especialista = bundle.getString("especialista");
            fecha = bundle.getString("fecha");

            SQLiteDatabase db_active=db.getWritableDatabase();
            ContentValues values = new ContentValues();
            values.put(Tablas.COLUMN_PACIENTE_TURNO,paciente);
            values.put(Tablas.COLUMN_ESPECIALISTA_TURNO,especialista);
            values.put(Tablas.COLUMN_DIA_TURNO,fecha);
            values.put(Tablas.COLUMN_HORA_TURNO,horas);
            db_active.insert(Tablas.TABLA_TURNO, null, values);
            db_active.close();

        }
    });
}
@Override
public int getItemCount() {return atencion.size();
}

@Override
public Filter getFilter() {
    if (filtro==null){
        filtro = new FiltroAtenciones(listaFiltrada, this);
    }
    return filtro;
}


}

AtencionHolder.java

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;



public class AtencionHolder extends RecyclerView.ViewHolder {

public TextView hora, dia;
public ImageView agregar;


public AtencionHolder(View itemView) {
    super(itemView);
    this.hora = (TextView) itemView.findViewById(R.id.itemHoraTurnoDisponible);
    this.dia = (TextView) itemView.findViewById(R.id.itemDiaTurnoDisponible);
    agregar = (ImageView) itemView.findViewById(R.id.addTurno);
}
}